Portable electric equipment and rechargeable built-in batteries

Details Portable electric equipment and rechargeable built-in batteries Portable electric equipment and rechargeable built-in batteries

1994-11-22

1996-10-22

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 56, 307 48, H01M 1046, H02J 332, H02J 734

Patent

active

055680380

ABSTRACT:
A battery use system for a battery-driven portable electronic equipment includes a first battery chargeable and serving as a direct power supply source, a second battery parallelly connected to the first battery through a switch, a voltage detection circuit for detecting an output voltage from the first battery, a consumption current detection circuit for detecting the state of the consumption current of the portable electronic equipment, and a switch control circuit for controlling open and close of the switch in accordance with an output from the voltage detection circuit and an output from the consumption current detection circuit. The switch is closed to charge the first battery by the second battery when the output voltage from the first battery becomes smaller than a predetermined value, and at the same time, the consumption current is sufficiently small.

REFERENCES:
patent: 3987352 (1976-10-01), Hirota
patent: 4287465 (1981-09-01), Godard et al.
patent: 4458111 (1984-07-01), Sugihara
patent: 5149985 (1992-09-01), Fujiwara
patent: 5343136 (1994-08-01), Yamaguchi et al.
J. R. Gyorki, Hybrid Battery Systems Take Charge, Machine Design, Nov. 9, 1989, pp. 123-127.
Patent Abstracts of Japan, vol. 17, No. 450 (E-1416) (6079) 18 Aug. 1993 JP-A-095 634 Apr. 16, 1993.

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